Nanashi will join Hachimaru's group
"Hachi" means "eight," and "Nana" means "seven." This also means that maybe the remaining six will have a numeric Theme Naming.- Jossed
Samurai 8 takes place in the same universe as EDENS ZERO
Their setting and elements are very similar, and Shonen Jump has teased a future crossover between their franchises.- Unlikely considering Samurai 8's cancelation.